Vodafone uk i have a new iphone5 . can i take the sim card from my old iphone3 and put it in my new phone

SOURCE: Exporting Contact Phone numbers back to sim card

write them down and then save them on your sim from your old phone

SOURCE: Is my iphone blocked ?

Is your sim card csm or cdma? I'm not sure if the iphone can handle both, but I know it works with GSM.

If you have a gsm sim card, then you just need to unlock it. Of course, Apple won't let certain carriers use their phones legally. So you have to unlock it. I don't remember the exact process, but there's a good program to help you through it step by step.

Go to this site and read up before trying to do anything technical with your phone (link)wikee.iphwn.org

There's a lot of informtion there, so make sure to read up to find what's best for you. You'll need to know the firmware your phone is using 1.1.4 to 2.2 you need to know. The site I posted should have all the info for you.

Again, if your sim card is gsm, it should be no problem to use your sim.

Alright, good luck.

Caid.

SOURCE: i have put in my sim card from my old phone into

Thats because you dident save your contact on the simcard, you contactlist is on the phonememory.
Put the simacard back in your old phone and save your contactlin on the simcard, them move the simcard to your new phone..and viola! there they are!

Good luck
Please take a moment and rate my help for you

Nic

SOURCE: iPhone SIM Failure

The phone is locked to Apple and needs a Security code to unlock it.
When you place a new or a existing SIM card from another phone provider into your mobile phone and it asks for a Security code then :-
This phone is locked to the original mobile phone provider. You need to contact this mobile provider to ask for the unlock code (security code) for this phone. You need to provide proof of ownership etc and the phone's unique IMEI number which is located inside the phone under the battery. They use this number to generate the unlock code for your phone.
They should provide you with instructions on how to enter this code into the phone.
Once you unlock the phone, then you can insert a new SIM card in this phone or sign up with another phone provider using this phone.
You could ring the phone provider and ask for the unlock security code because you are going overseas and wish to use your phone with a prepaid SIM card from another country.
The other way to get your phone unlock is to use a phone unlocking company on the Internet, they usually charge a couple of Dollars for their services. Use Google and search for “Security unlocking code”.